Shape(3I)

NAME

   Shape - what shape a canvas should have

SYNOPSIS

   #include <InterViews/shape.h>

DESCRIPTION

   A  shape  specifies  the  desired  characteristics  of  a  canvas.   An
   interactor should set the fields of its shape when it  is  reconfigured
   and should call Change on its parent if any of these fields change.

   The  dimensions of a shape are defined by a ``natural'' size, a stretch
   amount, and a shrink amount.  The width and height fields indicate  the
   desired  sizes.  The hstretch, vstretch, hshrink, vshrink fields define
   how flexible these desired sizes are.  For example, an  interactor  may
   have  a natural size of 100, but can adequately handle any size between
   50 and 200.  The stretchability for this case  would  be  100  and  the
   shrinkability 50.

   The  constants  hfil  and  vfil  are  provided to indicate ``infinite''
   stretching or shrinking.  They are represented as  very  large  numbers
   and   manipulated   exactly  the  same  as  other  stretch  and  shrink
   parameters.

   The aspect field specifies the desired aspect ratio.  A value  of  zero
   means any aspect is acceptable.

   The hunits and vunits fields indicate that the canvas dimensions should
   be multiples of some values.

PUBLIC OPERATIONS

   Shape()
          Construct a new shape with undefined natural size  and  infinite
          stretchability and shrinkability in both directions.

   boolean Defined()
   boolean Undefined()
          Test if the shape's natural size is defined or not.

   void Rect(int width, int height)
   void Square(int side)
          Short-hand for setting the dimensions of the shape.  Square sets
          both dimensions to side and sets the aspect ratio to one.

   void Rigid(int hshrink, int hstretch, int vshrink, int vstretch)
   void Rigid()
          Set the stretchability and shrinkability fields  of  the  shape.
          If no arguments are specified, the fields are set to zero.

   void SetUndefined()
          Reset the shape's natural size to be undefined.

SEE ALSO

   Interactor(3I), Scene(3I)

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